bonntitle.sty

\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{bonntitle}[2015/10/27]

\newcommand*{\university}[1]{\def\@university{#1}}
\newcommand*{\institute}[1]{\def\@institute{#1}}
\newcommand*{\birthday}[1]{\def\@birthday{#1}}
\newcommand*{\birthplace}[1]{\def\@birthplace{#1}}
\newcommand*{\worktype}[1]{\def\@worktype{#1}}
\newcommand*{\advisor}[1]{\def\@advisor{#1}}
\newcommand*{\theadvisor}{Advisor:~\@advisor}
\newcommand*{\secondadvisor}[1]{\def\@secondadvisor{#1}}
\newcommand*{\thesecondadvisor}{%
  \ifx\@secondadvisor\empty~\else Second Advisor:~\@secondadvisor\fi%
}

\university{%
  Mathematisch-Naturwissenschaftliche Fakult\"at der\\[.8em]%
  Rheinischen Friedrich-Wilhelms-Universit\"at Bonn%
}
\institute{Mathematical Institute}
\birthday{\fbox{\texttt{birthday}}}
\birthplace{\fbox{\texttt{birthplace}}}
\date{\today}
\author{\fbox{\texttt{author}}}
\worktype{Master's Thesis Mathematics}
\advisor{\fbox{\texttt{advisor}}}
\secondadvisor{}

\renewcommand\maketitle{\begin{titlepage}%
  \let\footnotesize\small
  \let\footnoterule\relax
  \let\footnote\thanks
  \null\vfil
  \begin{center}
    \parbox{10cm}{\centering\huge\bfseries\@title\par}\\[2.25em]
    {\Large\@author}\\[1em]
    Born~\@birthday~in~\@birthplace\\[1em]
    \large%
    \@date\\[9.25em]
    \@worktype\\[.91em]
    \theadvisor\\[.91em]
    \thesecondadvisor\\[.91em]
    \sc%
    \@institute\\[8.15em]
    \@university
  \end{center}
  \vfil\null
  \end{titlepage}%
  \setcounter{footnote}{0}%
  \global\let\thanks\relax
  \global\let\maketitle\relax
  \global\let\@thanks\@empty
  \global\let\@author\@empty
  \global\let\@date\@empty
  \global\let\@title\@empty
  \global\let\title\relax
  \global\let\author\relax
  \global\let\date\relax
  \global\let\and\relax
}

\endinput

dummy_thesis.tex

\documentclass[11pt, a4paper, oneside]{book}
% \documentclass[11pt, a4paper]{article}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Some package recommendations %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

% Must-have for scientific typesetting
\usepackage{amsmath, amsthm, amssymb, subcaption}

% Allows to type directly accents (save .tex with the UTF8 encoding!!)
\usepackage[utf8]{inputenc}

% Hypenation, spelling of some special keywords
\usepackage[english]{babel}

% Bibliography appears in table of contents, table of contents itsef doesn't
\usepackage[nottoc]{tocbibind}

% Inserts vspace between paragraphs instead of indent
% \usepackage[parfill]{parskip}

% Changes numbering system for equations
% \usepackage{chngcntr}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Title page setup %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\usepackage{bonntitle}

% Mandatory fields:
\title{Dialogue Concerning the Two Chief World Systems}
\author{Galileo Galilei}
\birthday{15\textsuperscript{th} February 1564}
\birthplace{Pisa, Italy}
\date{22\textsuperscript{nd} February 1632}
\advisor{Prof. Dr. Ferdinando II de' Medici}
\institute{Mathematical Institute}

% Optional fields and their defaults:
%
% \secondadvisor{Dr. Matthias Bernegger} % Defaults to an empty line
%
% \worktype{Master's Thesis Mathematics}
%
% \university{
%     Mathematisch-Naturwissenschaftliche Fakult\"at der\\[.8em]%
%     Rheinischen Friedrich-Wilhelms-Universit\"at Bonn%}
% }
%

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Some basic tweaking %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

% Define definition, theorem lemma, remark, corollary, proposition with
% numbering. Numbering is continuous within chapters, <chapter>.<statement>.

\newtheorem{definition}{Definition}[chapter]
% Put here "section" if you want    ^^^^^^^
% the numbering to be <section>.<statement>

% Apply the same numbering to Figure.
\numberwithin{figure}{chapter}

% Continuous equation numbering (doesn't depend on chapter)
% Requires \usepackage{chngcntr}
% \counterwithout{equation}{chapter}

% Equation numbering within section:
% \numberwithin{equation}{section}

\newtheorem{theorem}[definition]{Theorem}
\newtheorem{lemma}[definition]{Lemma}
\newtheorem{remark}[definition]{Remark}
\newtheorem{corollary}[definition]{Corollary}
\newtheorem{proposition}[definition]{Proposition}

% This code fixes some spacing issue with parskip and amsthm:
\begingroup
    \makeatletter
    \@for\theoremstyle:=definition,remark,plain\do{%
        \expandafter\g@addto@macro\csname th@\theoremstyle\endcsname{%
            \addtolength\thm@preskip\parskip
            }%
        }
\endgroup

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\begin{document}
    \maketitle
\end{document}